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I downloaded a copy of the v7.1 update for my 2006 400h gps. I burned it on a double layer DVD but I now don't have any idea what to do with the disk. Where do I install it in the car?

I recently had an oil change at the dealer and they mentioned I should consider replacing the original drive belt in my RX 350. I have 86K miles. Is this the same thing as the serpentine belt or timing chain I see mentioned elsewhere? Is this normal time for replacement? The dealer said the technician noticed my original drive belt had some cracks in it. I am trying to determine whether this is legit. Any help would be most appreciated.